Edward n



E. N. DICKERSON. l'HERMO-ELEGTRIG ELEMENT.

. N0.433,451-. PatentedAug.-5,1890= UNITED STAT S" PATENT OFFICE.

EDWARD N. DICKERSON, OF NE\V YORK, N. Y.

THERM'O-ELECTRIC ELEMENT.

SPECIFICATION forming part of Letters Patent No. 433,451, dated 5, 1890.

' Application filed Poliruar 27,1890- Serlal No. 841,944. (No model.)

To all'whom it may concern:

Be it known that L'EDVVARD N. DICKER- soN, of the city, county, andState of New York, have invented a new and useful Improvement inThermo-Electric Elements, of which the following is a full, true, andexact description, reference being'had to the accompanying-drawings.

- In the operation of thermo-electric elements it is exceedinglyimportant that the element should be highly heated at one point ofconnection, so that its heat shall approach the melting-point. Themetals ordinarily employed are liable tov fusion at comparatively. lowtemperatures.

I have devised a construction of thermoelectric element by which the endof the 'element is protected, while at the same time the ordinaryinsulation between the protectingcover and the element is dispensedwith.

My invention will ,be readily understood from the accompanyingdrawings,in which- Figure 1 shows a vertical section, and Fig. 2 a plan.

A represents the body of the olcmen t, which is preferably composed ofan alloy of sixty .per cent. of antimony and forty per cent. of

zinc; B B, the electrodes or connections, preferably composed of nickelor nickeline; C,the protecting metallic casing, ordinarily made'of iron,which protects the eufd of the element but extends only a part of theway over the surfaceof the element: The heat is of course applied to theprotecting end.

What I claim as my invention, and desire to secure by Letters Patent,is-

In .a thermo-electric element, the combination of a comparativelyfusible metal with a practically infusible cover surrounding one endofthe same only, thereby avoiding the necessity of insulation between thecover and the element, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

EQN. DICKERSON. Witnesses:

ANTHONY GREF, HARRY CONSTANT.

